I recently witnessed a debate on when to change the oil in a lawn mower. To be honest, I’ve never really given it much thought and usually did it in the spring. Apparently this is a subject that people are quite passionate about. The first position I heard was that at the end of the season the oil is contaminated with combustion byproducts that could be quite acidic, and should be removed from the mower before storing it for the winter. The second position was that condensation could occur in the oil over the winter so the oil should be changed at the beginning of the season. I’m sure that it probably makes very little “real world” difference but now I’m curious. I was also scolded for using the Briggs and Stratton Oil Removal Kit to pump out the oil rather than tipping the mower and pouring it out. I was told that I’m leaving sediment behind.